In-mold coat injection device

An in-mold coat injection device configured to hold a molding base material mold a first mold, press a second mold against the first mold to cover the molding base material and inject a predetermined amount of liquid coating agent into a coating gap formed between an inner surface of the second mold and a surface of the molding base material, the in-mold coat injection device comprising:

• an injection device body attached to the second mold;
• an injection port provided on an end portion of the injection device body for injecting the liquid coating agent into the coating gap;
• a measuring cylinder provided inside the injection device body and connected to the injection port;
• a piston configured to be moved inside the measuring cylinder in an axial direction of the measuring cylinder;
• a supply port provided at a side portion of the injection device body and connected to the measuring cylinder;
• a supply valve provided on a supply passage of the liquid coating agent connected to the supply port to close the supply passage when the piston moves to a discharge direction for reducing a volume of the measuring cylinder and open the supply passage when the piston moves to a suction direction for increasing the volume of the measuring cylinder;
• a gate valve slidably attached to the piston in an axial direction of the piston so that the gate valve is slid and moved between a valve opening position for opening the injection port and a valve closing position for closing the injection port;
• and
• an actuator configured to fill a predetermined amount of the liquid coating agent into the measuring cylinder by moving the gate valve to the valve closing position and moving the piston to the suction direction for introducing the liquid coating agent from the supply port to the measuring cylinder, and then discharge the predetermined amount of the liquid coating agent from the injection port by moving the gate valve to the valve opening position and moving the piston to the discharge direction.